N—二茂铁基—N‘—芳基取代硫脲的合成

Ｎ－二茂铁基－Ｎ＇－芳基取代硫脲的合成袁耀锋王斌王积涛刘娟（南开大学化学系天津３０００７１）（北京联合大学１０００５４）硫脲及其衍生物因具有抗结核活性、除草活性、对植物生长的调节活性等，从５０年代至今一直是人们感兴趣的课题［１］。生物活性测试结果表明...     

用N—取代三氯乙酰胺合成不对称取代脲

以无机碱作催化剂，用三氯乙酰苯胺与不同的胺反应，合成了８种不对称取代脲。     

3—N取代—5—氟脲嘧啶的制备新方法

报道了一种以Ｐｄ－ｃ为催化剂，使２－苄氧基－３－Ｎ－取代－５－氟－４－嘧啶酮在墁常压下氢解制备３－Ｎ－取代－５－氟脲嘧啶的新方法，合成了８个３－Ｎ－取代－５－氟脲嘧啶化合物，其中有些化合物具有一定的抗肿瘤活性。     

液—液相转移催化反应合成N—取代吩噻嗪

本文叙述以四正丁基溴化铵为相转移催化剂,液一液相转移催化合成了六个 N-取代吩噻嗪化合物。由于在方法上作了改进,所以产率均优于文献报导。     

N—芳基—N‘—取代噻唑基脲的合成与结构表征

由于植物细胞分裂素在植物生长发育中非常重要的作用 ,一直得到人们的重视 ,但其天然存在量微难以大量应用 ,故人工合成的化学结构类似物相继出现 ,主要有嘌呤类 ,如 6-苄氨基嘌呤 ( 6-BA)等 [1]和脲类化合物 ,如二苯脲类 ( DPU) [2 ]和N-苯基 -N′-( 1 ,2 ,3 -噻二唑 -5 -基 )脲 ( TDZ) [3]。人工合成嘌呤类植物细胞分裂素的结构改造一般以苯并杂环代替嘌呤环或嘌呤环上取代基进行结构变化 ,脲素细胞分裂素结构改造 ,通常是改变 N-取代基的化学结构 ,为寻找化学结构更类似天然植物细胞分裂素的化合物 ,在合成 N-取代苯基 -N′-( 6-苯…     

N,N—二甲基甲酰胺吸收氮氧化物对取代氨基脲的氧化

Ｎ，Ｎ┐二甲基甲酰胺吸收氮氧化物对取代氨基脲的氧化王彩兰王玉炉＊张深松王晓阳李建平（河南师范大学化学系新乡４５３００２）关键词取代氨基脲，ＤＭＦ－ＮＯｘ，氧化，偶氮脲１９９７－０３－１９收稿，１９９７－０７－０２修回国家自然科学基金，河南省自然科学基...     

N—烷氧甲基取代丙烯酰胺的制备

Ｎ—烷氧甲基取代丙烯酰胺的制备张志成，吴国忠，王胜，徐相凌（中国科学技术大学应用化学系合肥２３００２６）关键词丙烯酰胺，阻聚剂，醚化Ｎ－烷氧甲基取代丙烯酰胺的结构通式为：ＣＨ＿２＝Ｃ－ＣＯＮＨＣＨ＿２ＯＲ＿２Ｒ＿１＝Ｈ．ＣＨ＿３；Ｒ＿２＝Ｈ，Ｍｅ，Ｅ...     

N—取代苯基N′—（6—苯并噻唑基）脲类化合物的合成

为了寻找具有植物细胞激动素活性的新化合物,以苯并噻唑和取代苯胺为原料,将取代苯脲基引入到苯并噻唑的６－位上,合成了７个Ｎ－取代苯基Ｎ′－（６－苯并噻唑基）脲类化合物,它们的结构经元素分析、ＩＲ和＾１ＨＮＭＲ确定,７个化合物的合成收率分别为７４％,７６％,８５％,８２％,７０％,７３％和７２％。     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.